New engine build thoughts
Finally, after 13 years, I have my 408 torn apart for a rebuild. Going to change some parts to go faster. This list is what I had, and what’s going to be now:
LA 408 Chrysler
3250 with driver
Running at 5300’ elevation
Generally race 1/8 mile at home track in Montana, low 7.30s at 93 mph. For comparison of air density it ran 6.92 in Seattle last year in the 1/8.
New cam specs are .588/.600 lift, .250*/254* @ .050, 108 LSA (Was a Mopar Purple Shaft solid cam, intake and exhaust .557 lift, 252 duration @ .050, 110* LSA)
Ported Edelbrock Performer RPM aluminum heads (280/240 flow at .600 lift, 65cc chambers, 2.055/1.60 valves)
Was 9.9:1, now it will be 12.5:1
Weiand single plane intake
Going to use TTI 1 7/8 to 3.5” headers, up from Hooker 1 5/8 to 3” headers it had
Rons toilet injection throttle body on methanol (~1400 cfm)
1.5 rockers
4.30s, 28x10.50 tire
Based on what it’s going to be now I’d like opinions on what it may run. Going from the 9.9:1 to 12.5:1 compression especially with alcohol will be a huge difference. I can’t really believe it ran as well as it did before.
Finally, after 13 years, I have my 408 torn apart for a rebuild. Going to change some parts to go faster. This list is what I had, and what’s going to be now:
LA 408 Chrysler
3250 with driver
Running at 5300’ elevation
Generally race 1/8 mile at home track in Montana, low 7.30s at 93 mph. For comparison of air density it ran 6.92 in Seattle last year in the 1/8.
New cam specs are .588/.600 lift, .250*/254* @ .050, 108 LSA (Was a Mopar Purple Shaft solid cam, intake and exhaust .557 lift, 252 duration @ .050, 110* LSA)
Ported Edelbrock Performer RPM aluminum heads (280/240 flow at .600 lift, 65cc chambers, 2.055/1.60 valves)
Was 9.9:1, now it will be 12.5:1
Weiand single plane intake
Going to use TTI 1 7/8 to 3.5” headers, up from Hooker 1 5/8 to 3” headers it had
Rons toilet injection throttle body on methanol (~1400 cfm)
1.5 rockers
4.30s, 28x10.50 tire
Based on what it’s going to be now I’d like opinions on what it may run. Going from the 9.9:1 to 12.5:1 compression especially with alcohol will be a huge difference. I can’t really believe it ran as well as it did before.
