When I bought this engine it was advertised with 440HP with 10.8:1 compression. It runs very well with no signs of detonation. About 5000 miles now. Right now the heads are off for valve guide replacement (a whole other story), so the engine is apart. I might as well take advantage of the situation and see if I can make a little more HP. I would like to see it in the 500+ range.I go nostalgia drag racing once a year with the club. I like to do a little better each year.
I figure an 850 or so carb would help, but may lose some driveability.
A port job on the stock Dart SHP 200 heads would help some, probably expensive.
A bigger cam would also help, probably the cheapest route.
Best bang for the buck, what route would you go? Suggestions?
Also, I am coming up with more than 10.8:1 compression. Can someone calculate the compression for me? If it is as high as I am getting, I am surprised that there is no detonation.
Car:
2280# with driver
3.55 rear gear, (Frankland quick change)
26" rear tire
TH350C w/ 3500 stall
383 SBC, 4.030/3.75
Flat top forged pistons w/ 2 valve relief, 4cc, .005" out of the hole
Felpro 1003 head gaskets
200CC Dart SHP aluminum heads, 64cc, 2.02/1.6 (untouched)
Howards hydraulic roller cam: 180265-10
Lift: w/1.5 rockers .530/.545 (.565/.581 w/1.6 rockers installed)
Adv dur: 286/294
dur @ .050: 233/241
LSA: 110
Procomp Hi-rise air gap intake
QFT SL-750 carb vac.2ndary
HEI w/initial 24*+ mech 10* = total 34* +14* vacuum advance=48*
Autolite 5224 plugs @ .035
1-5/8 lake style headers into 2-1/2 exhaust in front of rear tires
10-11" Hg @ idle
93 octane only
Sorry this is so long. Sitting here bored tonight with nothing to work on.
I figure an 850 or so carb would help, but may lose some driveability.
A port job on the stock Dart SHP 200 heads would help some, probably expensive.
A bigger cam would also help, probably the cheapest route.
Best bang for the buck, what route would you go? Suggestions?
Also, I am coming up with more than 10.8:1 compression. Can someone calculate the compression for me? If it is as high as I am getting, I am surprised that there is no detonation.
Car:
2280# with driver
3.55 rear gear, (Frankland quick change)
26" rear tire
TH350C w/ 3500 stall
383 SBC, 4.030/3.75
Flat top forged pistons w/ 2 valve relief, 4cc, .005" out of the hole
Felpro 1003 head gaskets
200CC Dart SHP aluminum heads, 64cc, 2.02/1.6 (untouched)
Howards hydraulic roller cam: 180265-10
Lift: w/1.5 rockers .530/.545 (.565/.581 w/1.6 rockers installed)
Adv dur: 286/294
dur @ .050: 233/241
LSA: 110
Procomp Hi-rise air gap intake
QFT SL-750 carb vac.2ndary
HEI w/initial 24*+ mech 10* = total 34* +14* vacuum advance=48*
Autolite 5224 plugs @ .035
1-5/8 lake style headers into 2-1/2 exhaust in front of rear tires
10-11" Hg @ idle
93 octane only
Sorry this is so long. Sitting here bored tonight with nothing to work on.