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08-15-2008, 01:44 PM
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#41
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I, Vettezuki
Join Date: Feb 2006
Posts: 14,754
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Quote:
Originally Posted by BRUTAL64
Large journal.
I have a 75 L82 engine on the floor in my shop. It has pink rods. Look at your rods carefully--pink in good.  |
You mean the rods are actually pink?
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08-15-2008, 03:02 PM
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#42
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Neanderthal
Join Date: Mar 2008
Posts: 5,320
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Quote:
Originally Posted by Vettezuki
You mean the rods are actually pink?
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Yep, painted pink-Bright PINK. Can't miss them though. 
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64 Vette Roadster 400 ci
1990 F150 351 ci SuperCharged
48 Harley Pan Head 76 ci
2016 Nissan Altma
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08-15-2008, 03:09 PM
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#43
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Senior Member
Join Date: Aug 2008
Posts: 104
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Quote:
Originally Posted by big_G
Don't forget that pistons must match rod length for correct pin placement. 5.5-5.7 and 6.0 inch rods use different pistons. If you already have pistons for the 5.5 rod, they will only work with a 5.5 rod.
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I haven't got my pistons yet...they are on back order, and considering how hard it is to find -12.5cc dish pistons for a +.020 400, I can't imagine how hard it would be to find that same piston for a 5.7". |
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08-15-2008, 04:05 PM
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#44
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Neanderthal
Join Date: Mar 2008
Posts: 5,320
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Quote:
Originally Posted by Durango_Boy
I haven't got my pistons yet...they are on back order, and considering how hard it is to find -12.5cc dish pistons for a +.020 400, I can't imagine how hard it would be to find that same piston for a 5.7".
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The problem is the .020 over. If it was .030 it would be no problem. 
Back in 88 I just cut .135 of the top of a stock 400 piston for the 5.7 rod. Done. 
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64 Vette Roadster 400 ci
1990 F150 351 ci SuperCharged
48 Harley Pan Head 76 ci
2016 Nissan Altma
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08-15-2008, 09:31 PM
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#45
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Super Moderator
Join Date: Dec 2007
Posts: 6,850
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Someone has them, for a 6 if not a 5.7. No excuses, get er done... right!
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08-16-2008, 08:38 AM
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#46
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Senior Member
Join Date: Aug 2008
Posts: 104
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Quote:
Originally Posted by enkeivette
Someone has them, for a 6 if not a 5.7. No excuses, get er done... right!
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The set I am waiting on from Summit is not much more than $200 for the set of 8. The only other set I found for my engine was twice the price from a different company. As I said, if it's that hard to find the piston I designed the engine for, then using a different length rod will make it REALLY hard and I am not about to take the engine block back and have it bored +.030 when I already have pistons on the way.  |
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08-16-2008, 11:01 AM
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#47
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Neanderthal
Join Date: Mar 2008
Posts: 5,320
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Quote:
Originally Posted by Durango_Boy
The set I am waiting on from Summit is not much more than $200 for the set of 8. The only other set I found for my engine was twice the price from a different company. As I said, if it's that hard to find the piston I designed the engine for, then using a different length rod will make it REALLY hard and I am not about to take the engine block back and have it bored +.030 when I already have pistons on the way. |
What we have trying to tell you is, do it right the first time. I've had 400s with 5.5, 5.7 and 6 inch rods. ANYTHING Hiperformance should have at least a 5.7 rod.
Yes, your engine will run. It will have lots of LOW end torque. If you can be happy with that. Then, by all means, don't change a thing. 
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64 Vette Roadster 400 ci
1990 F150 351 ci SuperCharged
48 Harley Pan Head 76 ci
2016 Nissan Altma
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08-16-2008, 01:05 PM
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#48
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Senior Member
Join Date: Aug 2008
Posts: 104
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Quote:
Originally Posted by BRUTAL64
What we have trying to tell you is, do it right the first time. I've had 400s with 5.5, 5.7 and 6 inch rods. ANYTHING Hiperformance should have at least a 5.7 rod.
Yes, your engine will run. It will have lots of LOW end torque. If you can be happy with that. Then, by all means, don't change a thing. |
Ironically I prefer low end torque, and I like cruising more than anything. I will sometimes play with it and get crazy but I hardly ever go much past 3500 - 4000 RPM, and with that I'm expecting from the 400 I likely won't go much higher than that with it either. I don't ever race, just drive and cruise and have fun. |
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12-22-2008, 12:25 PM
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#49
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Senior Member
Join Date: Dec 2008
Posts: 123
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Not a thing wrong with low end torque. I can't say that I have enough, there's always room for improvement.
I think what everyone is trying to say here is that with the 400 rods (5.5) that the loads on the cylinder walls can get too high and cause a failure, of either the wall or the piston. Either one will be bad!
I've been looking/reading about this quite a bit- I have a perfectly good set of BB 6.135 rods, but I'm looking at building a 496 too. The recommended rod for that one is 6.385- and from what I've read, it's pretty much all about cylinder loading.
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12-22-2008, 12:29 PM
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#50
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Senior Member
Join Date: Aug 2008
Posts: 104
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Just to update everyone, I actually did go with 5.7" rods. Either I missed it in the description or it wasn't listed, but the new pistons I ordered need a 5.7" rod. I had the new pistons put on the new rods and have them installed. I had no block clearance problems and I won't know if I have cam clearance problems until the cam is ordered and test fitted.
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