Building 3L

[67cougar]

Im building a 3L nd i need to know some things:

Is there aftermrket pistons or rods, who can custom make cams for us?

I want to run 12:1 compression, with a 280-300 duration with 480-520 Lift on the cam somewere in the ballpark of those figures. Im lso going to need valve springs and retainers. Money is really no object, im going to be doing this over a period of time. I have the block already its knocked out 2mm. Now im just going to get some 2.5L heads, put 3L valves in them, with a port & polish & reshped chambers. I figuree ill just use the SVT IM with a extrued hone performed. Plus port matching, with a SVT throttle body, and cold air intake. Im also thinking about running custom headers, the MSDS headers dont have long enough primarys, plus they look a little rough, i know spce is tight in out engine bays but well see what i cn do. Thnks for the help guys.

[J-Man]

pauter-rods
ross-pistons, might be others but i cant remember
cat cams- cams

[DemonSVT]

If money is no object I suggest taking some classes.

480-520 lift cam on our DOHC engine. BWA-HAHAHAHAHA...
Let me know how many valves and pistons you go through. :banghead:

300 duration eh.

You already "knocked" the block out 2mm. So you mean you cut through the cast in liners and are into the cast aluminum block. Brilliant.

Then you are going to put 2.5L heads with their oiling deficiencies on the engine instead of doing your homework.


Let me guess. This is all going to be on a daily driver to and not a dedicated track car as well. Everyone needs a daily driver with a 7500-9000rpm powerband.

[67cougar]

Well i ment 0.020 not 2mm that was m fault on the block. as fo the heads m undestndng was that 2.5L head was a better head to use. i guess i was told wrong, as fo the cams im comng fom v8's were that big of a cam is fine.

[DontAsk]

Are you building a 3L for your '67 cougar?

[Zalec]

Originally posted by: DontAsk
Are you building a 3L for your '67 cougar?

thats what i was wondering :rofl:

[GrandMasterKhan]

The oval port heads machined out to match the 2.5L intake manfolds will easily out flow FULLY race port and polished 2.5L heads. There is lots of information on our forums regarding these heads including how to needed to machine them out.

[67cougar]

haha no my 67 has a 289 HiPo bored out 0.060ths 3 core radiator, because with that much of a bore it like to get hot. 11.5:1 CR 578lift on the cam, bigger valve relifes in the pistons to allow the higher lift with out piston to to valve problems, or even get close to having a problem with that. World heads, RPM airgap mani with a 800cfm carb ect ect. The down side to all that is it only gets about 10mpg if that. So im used to building V8's so i didnt think nything of the lift when i said it. So if port matched 3L heads flow better then 2.5L ill just keep those. I was going to sell them but i will keep them now that i know that. haha. Thanks for the info guys, youve prob. saved me alot of headaches, and switching parts. I still want to run custom cams, who will make them and what would the best lift be for a DOHC engine seice im new to them?

Thanks

[PuckPuck]

All I can say is... be prepared to fall off your chair when you read the prices for cams on our car.... since it's a DOCH "V" configuration engine, you are looking at 4 cams, with 6 lobes each, and one of them carrying a pulley for the water pump on the other end... compared to a pushrod, where you only need 1 cam, it might make you shiver....


as for the little pea shooter (that's what i call 289s)... nice work... for a while when i was younger, we ran a pea shooter in the race car, bored out 60 thou, running 7000+ rpm around a 3/8 dirt oval, in the late model / super stock class... my dad being the main sponsor, refused to let the driver put a tach in the car, in fear he would ease off... we were litteraly winning the feature nearly every single week, dominating the points all season.... finally towards the end of the season the motor let go and we replaced it with something bigger.... but still, hearing that motor scream coming out of the corners, overtaking every car on the track, was amazing... "the little motor that could... really did"

[Massiv]

Originally posted by: GrandMasterKhan
The oval port heads machined out to match the 2.5L intake manfolds will easily out flow FULLY race port and polished 2.5L heads. There is lots of information on our forums regarding these heads including how to needed to machine them out.


That didn't appear borne out in the numbers Kinger posted a while ago.

Massiv.

[ov3n]

Originally posted by: Massiv

Originally posted by: GrandMasterKhan
The oval port heads machined out to match the 2.5L intake manfolds will easily out flow FULLY race port and polished 2.5L heads. There is lots of information on our forums regarding these heads including how to needed to machine them out.


That didn't appear borne out in the numbers Kinger posted a while ago.

Massiv.


Intake
Lift - Oval PnP/2.5 PnP
100 - 121/138 CFM
200 - 201/192 CFM
300 - 252/238 CFM
350 - 280/296 CFM
400 - 292/302 CFM

Exhaust
Lift - Oval PnP/2.5 PnP
100 - 80/64 CFM
200 - 131/126 CFM
300 - 182/176 CFM
350 - 212/216 CFM
400 - 218/216 CFM

[Rikenbomb]

Somehow easily outflow just doesn't come to mind.

[BobKaBob]

Originally posted by: Rikenbomb
Somehow easily outflow just doesn't come to mind.plus running n/a, you want the 11.2:1 compression of the 2.5 heads... as long as youre not one of these people that get hung-up over the oiling issue (wich EVERY 2.5 is succeptable to).