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Old 01-23-2009, 08:43 PM
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new to building, opionions on my build please?

I'm new to the forum and am excited to hear feedback on my build im undertaking. First, the car is a 84 rx7. I have torn the entire drive train out and have the new motor and trans in it and am waitting for warm weather to come again to finish up the minor work thats left like the clutch master/slave, the cooling and wiring.

this is what i'd like the opionion on how good of a combo this is and what kind of power i could expect along with whats not going to work or needs to be changed.

87 305 tpi out of a iroc along with the t5.
i took the top end apart, cleaned everything, new gaskets, and new oil pan.
street dominatior intake
holley 4150 dp 650cfm
lt1 cam, factory roller valvetrain
summit ignition box and coil
new points distributor
1 5/8 inch headers
new zoom clutch.

also, i can't find a new oil dipstick that fits it, reg small block ones are too big?

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Old 01-23-2009, 08:45 PM
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motor was running well and had 79,xxx on engine and tranny so i checked out the bottom end when installing my grannys speed shop oil pan and everything looked like it was just put together yesterday.
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Old 01-24-2009, 07:06 AM
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Post up some pictures if you can. Sounds like a fun build.

I put a 307 in my '79 RX7 (although I used a 350 trans, not stick) and it went together pretty slick. The three major problems I ran into were:

1) The air cleaner sat too high and interfered with hood closing...had to basically fab a pancaked air cleaner.
2) The 307 radiator had to be set at an angle and dropped down below the body line in order to fit.
3) And the one which you may not have encountered yet...if you run the stock suspension you might have a "front heavy" feeling to the handling. I just drove mine that way until I sold it but I'm sure it could be corrected with proper springs and shocks.

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Old 01-24-2009, 11:42 AM
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i've heard of those problems,
1. i'm cutting a 14' hole to fit the air cleaner through the hood and bolting a cowl over top for a true cowl hood.
2. the 84-85's came with a bigger radiator that you can remount and use.

3. i'm curious to see how heavy it feels, i could always get springs but other than the iron heads, it's not to heavy of a motor tranny combo.

any one have input on the motor itself or what you think it might have for power?
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Old 01-24-2009, 11:51 AM
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Old 01-24-2009, 12:53 PM
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305 and LT1 cam motor= use 6500 rpms rated normal 5amp HEI dist

ign box is "needed" to solve ign problems when you use a mega cam...
points and a ign box is less than a best choice...
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Old 01-24-2009, 02:38 PM
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i understand that the points choice is less than best, but clearence issues from the firewall is common with this swap and forces the use of a points style. i got a completly new distributor, cap, and rotor to go alone with the summit 50,000v coil and digital ign box hoping the make the ignition somewhat strong. should this be a strong motor for a street car? (should weight less that 2500 with me in it plus the 5 spd and 3.90 rear end?
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Old 01-24-2009, 04:45 PM
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LOL,,,only 2500lbs and 3.90 gears and the 307= getting traction will be the limiting factor for "fast"!!!!

food for thought:

there are 10? different "small body" solid state dist available...
here's a random pick example:
http://www.classicchevy.com/product....2&dept_id=1283
(doesn't have to be a HEI, MSD and others make "small body" dist)

there are 10? "small body" solid state dist bodies designed for high rpms that require a ign box and designed for it...

basically 2 risks with a small body points dist:
how stable is the on/off/on/off signal to the box at high rpms...
can the small diameter cap handle 50Kv without cross fires between the caps contacts at high rpms....
(either one can make a kaboom)

stock HEI, Ford Duraspark, approx 14-16Kv spark had to use a bigger cap for more contacts spacing for no cross fires at high rpms...

with a induction ign, just reduce the plug gap lowers the Kv jumping the gap in the cap....
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Old 01-24-2009, 04:53 PM
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i'll have to look into those solid states for sure,

just bought a nice set of 609 vortecs with <70,000 miles on them i want to bolt up to this combo, think these with some z28 springs should help some over the factory 305's?
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Old 01-24-2009, 05:24 PM
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Was this a "before" shot? Otherwise it looks like you don't have any hood clearance problem at all.

I was going for the sleeper look when I built mine. That's why I didn't put a scoop on it. You can also see in the picture how the radiator is peeking out the bottom side just behind the bumper. Unless they were really alert, most people didn't even notice it on the street.



As long as you can keep the tires hooked up, yours should be quite quick.
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Old 01-24-2009, 05:49 PM
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that was pre motor swap. i'm excited to see what its going to run the 1/4 in.
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