421 cube pulling truck engine
Posted: Fri Jan 19, 2018 9:02 pm
Buildin a new engine to go in my son's Pulling truck for next year (2018). It's for IAMO 6200 LB pro street.
Thought I'd share it and ask a few questions.
Below is a link to the rules.
https://docs.wixstatic.com/ugd/c23712_c ... b94976.pdf
The build, what I have so far.
Dart SHP PRO block, plate honed to 4.156" bore zero decked
Callies Magnum crank 3.875 stroke, 350 main 2" rod journal
Callies Ultra h beam rods 6" x 2" rod journal.
Custom JE pistons pistons with 11cc dome, vertical gas ports, a bit heavier than I'd like @ 499 gram
Compression is at 14.8-1 as of now without more milling (testing with slight dished valves)
Total Seal .9 x .9 x .125" x 2 mm rings. steel top, napier second
Crower endurx .904" lifters with offset intake
Comp Cam 274 in x .460" lobe lift 287 ex x .440" lobe lift, on 112 LSA big block journal
Jesel shaft rocker 1.7 in = .782" lift / 1.6 ex = .704 lift.
2970 intake, ported and matches ports well
1.59 venturi x 1.79 throttle bore 4825 series Braswell carb.
Spacers to try on the dyno
GZ sportsman vacuum pump
Heads are GMPP large port vortec bowties
Pushrod area is welded and opened to 2.6 ish csa
Curently valve job is set up for 2.08" x 1.58 valves ( not much room for more )
May be able to fit 2.09"
Ports are 235 cc-237 cc so far. Probably end up 240 ish
Heads still in progress.
Still need to buy intake valves. Going Titanium intakes. Got good access to Manley. They'd be about 88 gram
Got a new set of Ferrea f2247p 1.6" steel ex valves sittin in the shop I could use. 99 gram. I have them and it'd save a little money for tow fuel. LOL Gonna be a lot of miles on the tow rig this summer.
Any opinions on valves ?
Still need valve springs. Thinkin Pac 1325 springs ,but have good access to Manley Nextec?
Any opinions on springs ?
Titanium retainers?
Headers ?? It's a 1990 k 3500. Not a lot of header options and I'm not sure I have the welding skill to make a set.
Headers can't go out the hood.
Opinions on header sorce and size ?
If I made a set I'm thinking 1 3/4 x 1 7/8 step
I expect it will make peak HP about 7200-7300 but it will need to hang on to power past peak as far as it can.
And, it will need to make as much TQ around peak TQ as possible for when the track is tight and the sled guts the engine.
Probably test it on Q 16 and 114
What kinda power should I expect ?
Sorry for the long post.
Randy
Thought I'd share it and ask a few questions.
Below is a link to the rules.
https://docs.wixstatic.com/ugd/c23712_c ... b94976.pdf
The build, what I have so far.
Dart SHP PRO block, plate honed to 4.156" bore zero decked
Callies Magnum crank 3.875 stroke, 350 main 2" rod journal
Callies Ultra h beam rods 6" x 2" rod journal.
Custom JE pistons pistons with 11cc dome, vertical gas ports, a bit heavier than I'd like @ 499 gram
Compression is at 14.8-1 as of now without more milling (testing with slight dished valves)
Total Seal .9 x .9 x .125" x 2 mm rings. steel top, napier second
Crower endurx .904" lifters with offset intake
Comp Cam 274 in x .460" lobe lift 287 ex x .440" lobe lift, on 112 LSA big block journal
Jesel shaft rocker 1.7 in = .782" lift / 1.6 ex = .704 lift.
2970 intake, ported and matches ports well
1.59 venturi x 1.79 throttle bore 4825 series Braswell carb.
Spacers to try on the dyno
GZ sportsman vacuum pump
Heads are GMPP large port vortec bowties
Pushrod area is welded and opened to 2.6 ish csa
Curently valve job is set up for 2.08" x 1.58 valves ( not much room for more )
May be able to fit 2.09"
Ports are 235 cc-237 cc so far. Probably end up 240 ish
Heads still in progress.
Still need to buy intake valves. Going Titanium intakes. Got good access to Manley. They'd be about 88 gram
Got a new set of Ferrea f2247p 1.6" steel ex valves sittin in the shop I could use. 99 gram. I have them and it'd save a little money for tow fuel. LOL Gonna be a lot of miles on the tow rig this summer.
Any opinions on valves ?
Still need valve springs. Thinkin Pac 1325 springs ,but have good access to Manley Nextec?
Any opinions on springs ?
Titanium retainers?
Headers ?? It's a 1990 k 3500. Not a lot of header options and I'm not sure I have the welding skill to make a set.
Headers can't go out the hood.
Opinions on header sorce and size ?
If I made a set I'm thinking 1 3/4 x 1 7/8 step
I expect it will make peak HP about 7200-7300 but it will need to hang on to power past peak as far as it can.
And, it will need to make as much TQ around peak TQ as possible for when the track is tight and the sled guts the engine.
Probably test it on Q 16 and 114
What kinda power should I expect ?
Sorry for the long post.
Randy