Dennis Wilkie
Veteran Member
- Mar 17, 2020
- 539
Big block engine code
- Thread starter Dennis Wilkie
- Start date
jbloake
Veteran Member
Don’t have much info on these new engines Looking like Gen 6 454 4 Bolt cast Dec 15 1997 . Likely used in 1998. Please correct if mistaken
Dennis Wilkie
Veteran Member
- Mar 17, 2020
- 539
Yeah, that's about as good as my guess is. Really all I know is that it's a Gen VI based on the fuel pump boss and Vortec heads. I probably should've been a little more specific. I was trying to figure out a date so I don't order the wrong timing gear set, among other things. I'm approaching the $10,000 mark in parts, and I just put it on the stand I built 3 days ago. It's bored .030 and i've already got the conversion kit to swap out the non-adjustable valvetrain. I'm using a flat top piston with a Comp Cams Thumpr CL01-600-8 cam, and Assault Racing PC305 high-rise intake. But it's been Hell trying to find a set of valve springs that will clear the seals, and doesn't require cutting the valve guides
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sandlapper
Veteran Member
pistons: sealed power H661CP
5/64" 5/64" 3/16"
JMO cheaper hypers with thick old-fashioned tractor-style ringpak
perhaps better than KB claimers but that's about it
5/64" 5/64" 3/16"
JMO cheaper hypers with thick old-fashioned tractor-style ringpak
perhaps better than KB claimers but that's about it
Dennis Wilkie
Veteran Member
- Mar 17, 2020
- 539
With these heads you don't have many .030 piston options, at all. Domed are out of the question, and dished are gonna drop the compression way below 9:1. So that pretty much leaves you with about 8 to choose from, unless you want to wait until next year for backordered parts, and time is a luxury that I just don't have anymore. I have to have all of this together, and my transmission rebuilt again before August 30th or I might not ever get the chance to hear it run. The gains or losses from a slim flat top piston selection are so minor in this 5000 lbs 4WD, that it wasn't worth wasting the time to calculate it. Oh....I completely forgot to mention that I sold my "cobbled together" L89 for $4000, 3 weeks ago, and then got paid another $1000 to put it in a 1977 El Camino. Not bad for an amateur
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sandlapper
Veteran Member
We'll be there next week with bells on --- and a trailerload of our local junk $$$$$ 
