SCJ bowl ported potential

was wondering about the flow and horsepower potential of a set of scj heads with a good bowl port and gasket match. engine is a 545 with 11.7 compression victor/ with dommy and a roller cam. have started the parts buying process and am already commited to this combo but really would like some outside opinions.

thanks craig

more compression...... these engines like compression.....


Randy

Only way to know what they flow is to flow them. Depending upon who did the work, they could be good or not so good... Just making things "big" isn't the answer.

the Coug wrote:more compression...... these engines like compression.....


Randy

YEA ... 11.7/1 is about useless.
To high for gas at the pump and not enough for race gas ... I guess you could mix it.

IF the bowl porting is done correctly then there is more than 350 CFM at only .500" valve lift and around 370 CFM maximum on the intake with about 220 CFM maximum on the exhaust side.

thanks the compression is a compromise, the motor will get a 200 shot after the chassis is sorted out and i don't want it too high because of my limited tuneing ability

The SCJ's respond to bowl porting better than any heads I have ported,, ,,,, ( except for the Pro-Comps ) Can't believe I posted that.

Also to add to what Randy M said, that max intake flow number will be around .570 lift also.

IDT-572 wrote:The SCJ's respond to bowl porting better than any heads I have ported,, ,,,, ( except for the Pro-Comps ) Can't believe I posted that.

Also to add to what Randy M said, that max intake flow number will be around .570 lift also.

Blake, YOU GO TO TIMEOUT YOUNG MAN. WE WILL NOT TOLERATE SUCH TALK IN THIS HOUSE

bbf-falcon wrote:

IDT-572 wrote:The SCJ's respond to bowl porting better than any heads I have ported,, ,,,, ( except for the Pro-Comps ) Can't believe I posted that.

Also to add to what Randy M said, that max intake flow number will be around .570 lift also.

Blake, YOU GO TO TIMEOUT YOUNG MAN. WE WILL NOT TOLERATE SUCH TALK IN THIS HOUSE

Yep Dutchlincoln is the only guy who has the knowlege to post anything about them P/C heads. He da man

dfree383 wrote:Aluminum scj's or iron factory ones?

I prefer the bronze ones .

Just a thought! Lem what did those cast iron CJ heads of David Morehead flow that performed so well?

Dave.

LivermoreDave wrote:Just a thought! Lem what did those cast iron CJ heads of David Morehead flow that performed so well?

Dave.

Not as good as was thought after it was found to have NOS plumbed under the tunnel ram . I'd guess that may have something to do with the split cyl. walls and the cracked Byrant crankshaft.....NOS is free power you know...you just gotta buy the parts

86 coupe wrote:thanks the compression is a compromise, the motor will get a 200 shot after the chassis is sorted out and i don't want it too high because of my limited tuneing ability

first of all if you have a limited tuning ability, you should be asking yourself one Question, should you be building an engine and racing it????? Because Tuning is 75% of it after you build it or Have it built then you have to have some kind of Idea what you are doing or Boom you detonate it or what ever and all the rods hang out the bottom of the Block.....
so I would suggest getting a book or with someone and learning how to tune an engine.... really fast....



Randy

hey coug i agree that a big boom may happen. i have raced for most of my life but haven't in about 12 years, also have only made one nitrous pass in my life, but you can only learn by asking, reading or doing , and im tired of books and talking. by the way thanks everyone for your input

You can still run Nitrous with more compression

If you bump up the compression to 13-ish to 1 then you may not want or need Nitrous

Damon i agree that it would run fast enough with out it, but i already have the parts so for this motor i'm stuck

86 coupe wrote:Damon i agree that it would run fast enough with out it, but i already have the parts so for this motor i'm stuck

gotcha, you already have the pistons... Sounds like me, run what you've got........ unless you could sale them and get flat tops