olds 307 and 403

Yeah, those Edelbrock heads are a good deal right now. It is only $115 for that base Jegs converter, it depends how quick you are swapping the trans. I have used a couple of 2004R converters. The Oregon Performance 2000 to 2600 stall lock up converter, flashed at 2400. I imploded it at the track. It was supposedly rated 400 HP, I was a little more than half that from my 403, decent torque though. My current PATC base model 2200 to 2500 lock up converter, flashes at 2300 is much nicer. Less slippage down low, acts completely stock till you get on it.

Kyle's77cutlass

Aluminum or cast heads!?!?! Thats the question which will get a million answers.
I just built a 350 for my son, I didn't go that crazy with the guts and she is 450hp and 490tq.
I used #8's and ported and polished them myself. Filled the heatrisers as well. I used the home porting thread that is on here and also asked alot of question on how too. Took a while to do it but they turned out amazing.
I could of went with aluminum like alot said I should, but I didn't. I stayed with #8's to keep her stock looking, did it cost me more? I think it did, just didn't add the cost yet. Would I use cast on my next build? Hell yeah!!!!!!Aluminum still need some machining to tweek them to fit.

olds403

For the 2004r - get a decent convertor from a good shop. I have bought them from Ckperformance and extreme automatics. FYI. There is a usually a lot more to a 2004r than just a reseal job. Unless you really know the trans condition- it probably needs more. I’ve never found one used that didn’t need a full rebuild. Direct clutch and band is usually toast. Not a hard trans to build, but hard parts are getting very hard to find.

Kyle's77cutlass

lol I think you posted this on the wrong thread

Kyle's77cutlass

Went through my bill for my heads,
From cleaning, machining to assembly is $1100.00.
Then for valves and springs $300.00.
Total $1400.00
Then my time in my shop for port, polish and fill heat risers, I must be 32 hours into them.
Was my first time porting, next round probably down to 20 hours.
So $1900.00 for a fully set of port and polished is a fair price imo.

bigdooly

Thanks I saw them. I would need to go get all new valve train parts. You coming my way anytime soon? Happy New Year.

bigdooly

Thanks to all for your feed back. I will be doing the 5 heads.
Happy Motoring!!!!

olds 307 and 403

Polish the chambers, run 93 and don't be conservative on the cam with 10+ to 1.

bigdooly

it already has a mild cam in it. My machinist has a program we estimate the compression ratio at just below 9.5 : 1. 9.4 something to one. He rebuilt it originaly. I have been putting 93 in it all along .
Im not gonna mess with the cam now.
I told him to go all out on the heads, we will likely port mach the intake I got from. Kennybill also.
Just finished completely redoing the front end now it's time to clear snow.
Aaaaaaahhhggggg.!!!!!!!!
Thanks for the response stay warm
Jim

olds 307 and 403

What pistons are in your motor right now. Anything but the 6cc dish LF2321 Speedpro pistons will put you way under or way over that number. I had 9.6 to 1 Olds 350 with .065" quench with the 204/214 cam. I had to retard the timing to stop pinging along with cold plugs. Also the stock 403 Qjet was too lean at idle, idled shitty and very bad from idle to part throttle. It ran 14's but was less peppy with less timing at part throttle on the street.

bigdooly

I dug out build sheet from when engine was done. Sealed power 332-AP-30. They look like domed pistons in jegs ad. I thought the builder said he used flat top pistons. The motor was done in 2005, and sat in my garage covered on a stand until memorial day 2018, that wkend is when it ended up in the T/A. So can't expect him to remember what was done to an engine 13 years prior. Cam I believe is a Melling . I am trying to interpret all the part #'s on the sheet by googling #'s. It was a metalic blue 75 350 out of a delta 88. I asked it to be built to 1970 specs , because i wanted a little more than the 170 or 180 hp th 75 motor had, nothing crazy because it was gonna go back in the delta. the guesstimate I was given is 265 as she is now. The carb was jetted it is a not stock 403 qjet anymore. It runs very well and sounds nice, but I want a little more out of it.

olds 307 and 403

Actually those are 24cc dish cast replacement pistons. With your current #8 heads, you probably have 7 to 1 compression, probably not close to 265 hp. The Melling cam is probably their version of the 204/214 cam, which is fine for the low 8 to 1 compression the #5 heads will give.

bigdooly

Ok thanks maybe new pistons in my future as well as new heads. When the heads are done I guess I'll know for sure.

olds 307 and 403

Another thing to check is how far down the pistons are in the hole when at TDC. They are usually. 040" below deck, lowering compression even more.

bigdooly

Thanks again. I