Newbie building a performance 454 needs experienced advise
#51
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What is an l29 motor anyway?
Edit. Nevermind. I just looked it up. It's the 310hp with cast internals.
Mine is not an L29. It's a 385hp mag
Edit. Nevermind. I just looked it up. It's the 310hp with cast internals.
Mine is not an L29. It's a 385hp mag
Last edited by pjv911; 04-11-2017 at 04:47 PM.
#53
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Agree, the 454 MPI is a 454 with 502 heads
#54
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454 magnum and 502 magnum use the same gm heads.
#55
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Yep . The l29 is the one with flat tops . The 7.4 mag uses 9 or 10cc domed pistons to complement the different chambers of the non vortec head. If i remember corectly the dome size was the same on the 502 je pistons , and the extra cubic inches of the 502 block under the 099 heads gave the 502s an extra .25 compression ratio.
But it is still early , and i have not finished my grande burrito yet.
But it is still early , and i have not finished my grande burrito yet.
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#59
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https://goo.gl/images/niMiDK
They look like this exactly
They look like this exactly
#60
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correct,i just took the heasd off of a 1990 330 and that is exactly what i see.my guess is the engine in question is not a magnum.a merc 330 has a cast crank and cast flat top piston.